Can someone please explain Jame's interpretation to loose vermiculite filled in between the dome (over the insulating blanket) and the exterior walls. I see some people going with the combination vermiculite and concrete mixture for 4-5 inches over the insulating blanket, then loose filling the remainder area with vermiculite. per Jame' PDF, one would just have the insulating blanket, then loose filling with the vermiculite. Is there a need for the vermiculite and concrete mixture?
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